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A road has been cordoned off in Bootle, with a large police presence on the street.
Wolfenden Avenue has been closed off by officers, with witnesses reporting around six matrix vans at the scene.
Someone living close to the scene reported hearing a "gunshot" but this has not been confirmed by police.
Armed officers were also spotted working at the scene.
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Sophie McCoid
People on the street are being told to stay in their homes
People within the cordon are being told to stay in their homes by police
Sophie McCoid
Police checking under cars within the cordon
Sophie McCoid
Fire and ambulance services attended Balliol Road
Abby said: "I’ve been told by witnesses in Balliol Road the North West Ambulance Service and Merseyside Fire and Rescue Service attended the scene there. They added that it looked like three people were checked over."
Sophie McCoid
Armed police were also spotted on Wolfenden Avenue
Sophie McCoid
The police helicopter is circling
The helicopter took off from Hawarden Airport in Wales around 10 minutes ago and is now circling over the area.
Sophie McCoid
Armed police car appears to have made contact with a car
Sophie McCoid
Black and blue car damaged at Balliol Road
Two cars appear to have been damaged in the crash at Balliol Road
Sophie McCoid
Distance between the two cordons
This is how far the two cordons are away from each other
Sophie McCoid
Detectives have left the scene at Wolfenden Avenue
Detectives have left the scene at Wolfenden Avenue, but a cordon remains in place.
We are still waiting for a police statement to confirm the nature of this evening's incident
Sophie McCoid
Armed police on Balliol Road
Armed police are on Balliol road and it appears two cars have been damaged in a crash
Sophie McCoid
Woman watching I'm a Celeb heard "loud bangs"
Abby has been speaking to people who live close to the scene.
A woman who lives on Wolfenden Avenue said she was watching I’m a Celebrity when she heard what she described as a “loud bang” followed by a car “screeching away”.
We have had no confirmation from Merseyside Police on the nature of this incident and have asked for a statement
Sophie McCoid
Activity appears to be centered on one house
Police activity appears to be centered on one home on Wolfenden Avenue, with a number of officers standing outside the property
Sophie McCoid
Detectives arrive at the scene
Detectives have arrived at the scene and are being taken through the cordon by officers
Sophie McCoid
Police helicopter was circling above the area
Witnesses have told Abby that "a police helicopter was seen circling over the area just an hour or so ago"
Sophie McCoid
Unclear if the two cordons are linked
Sophie McCoid
Another cordon at Balliol Road
Our photographer has reported another scene at Balliol Road in Bootle, which is a four minute drive from Wolfenden Avenue, but its not yet known if the two scenes are connected.
The scene on Balliol Road appears to be because of a car crash.
Sophie McCoid
Police cordon within another cordon
Abby is reporting that "There appears to be an inner cordon which covers a small number of houses"
Sophie McCoid
Huge cordon and police presence
Our reporter Abigail Nicholson is at the scene, where she says there is a "huge cordon"
Sophie McCoid
Police appear to be looking under vehicles
People at the scene have reported that police are looking under vehicles, but it's not known what they are looking for
Sophie McCoid
Video of armed police at the scene
Sophie McCoid
Large police presence
A large police presence has been reported at Wolfenden Avenue in Bootle.
The road has been cordoned off, with numerous vehicles spotted at the scene.
It's not yet known what the incident is, but people living near to the scene reported hearing a "gunshot", but this has not been confirmed by police